Interchangeable LED Units for Compact Flashlights
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Solution Overview
Problem
Existing flashlights employing incandescent or halogen/xenon lamps face inefficiencies in energy consumption and fragility, while LED flashlights with single T1 ¾ LEDs lack brightness and focusing capability, and Luxeon LEDs require additional components for efficient use.
Innovation Solution
Design of thermally and optically efficient LED units incorporating one or more LED dies, a metal base acting as a heat sink, optical material, a reflector, and a lens, integrated with a metal cylindrical housing and control unit for efficient energy use and compact size, allowing for interchangeable colors and long lifetimes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single T1 3/4 LED lamp is used, then the flashlight is compact, but the brightness is too low
Solution Approach 1:
The patent combines multiple T1 3/4 LED lamps (typically three) within a single compact head assembly, merging their light output to achieve sufficient brightness while maintaining a compact form factor. The integrated design allows multiple LEDs to work together without requiring a larger housing.
Solution Approach 2:
The patent nests multiple LED components, reflectors, and optical elements within a compact hierarchical structure. The T1 3/4 LED lamps are positioned within a confined head assembly that contains all necessary optical components in a nested arrangement, maximizing space utilization.
2Illumination intensity
If multiple T1 3/4 LED lamps are used, then the brightness increases, but the flashlight head size becomes large
Solution Approach 1:
The patent merges multiple LED light sources and their associated optical components into a single integrated head assembly. By combining the functions of multiple LEDs, reflectors, and focusing elements into one compact unit, the design achieves high brightness without proportionally increasing overall size.
Solution Approach 2:
The patent optimizes the local arrangement of optical components around each LED to maximize light extraction and direction efficiency. By improving the quality of light management in the local head assembly region through optimized reflector geometry and lens positioning, the design achieves high brightness output from a compact volume.
3Illumination intensity
If Luxeon type LED is used, then the brightness and focusing capability improve, but additional heat sink and reflector components are required
Solution Approach 1:
The patent merges the heat dissipation function into the existing flashlight body structure. The cylindrical housing serves dual purposes as both the structural enclosure and the heat sink, eliminating the need for a separate heat sink component. Similarly, the reflector is integrated into the head assembly rather than being a separate attached component.
Solution Approach 2:
The patent makes the cylindrical housing multi-functional by using it both as the structural body of the flashlight and as the heat dissipation component. This universal design allows the same component to fulfill multiple functions, reducing overall device complexity while maintaining effective heat management for high-power LEDs.
4Device complexity
If incandescent bulbs are used, then the flashlight structure is simple, but energy consumption is very inefficient
Solution Approach 1:
The patent changes the fundamental operating parameters of the light source from thermal incandescence to electroluminescence. By switching from incandescent bulbs to LED technology, the system operates on different physical principles that are inherently more energy-efficient, converting electrical energy directly to light rather than heating a filament to glow.
5Use of energy by moving object
If halogen and xenon lamps are used, then energy efficiency improves, but the filaments remain delicate
Solution Approach 1:
The patent replaces the mechanical filament structure with solid-state LED components. By substituting the fragile filament-based incandescent and halogen/xenon lamp systems with solid-state LED technology, the design eliminates the mechanical weakness of filaments while maintaining or improving energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a compact, energy-efficient, and long-lasting LED flashlight with improved brightness and focusing capabilities, eliminating the need for additional heat sinks and reflectors, while ensuring reliable operation and water resistance.
Implementation Method 1
Flashlights utilizing unique LED light sources
Implementation Method 2
The LED dies can be any color LED dies. The white lights may be produced from UV or blue LED dies coated with corresponding phosphors
Implementation Method 3
The metal base is a heat sink for the LED dies
Implementation Method 4
The metal base is a heat sink for the LED dies. A LED unit can be smaller than 1 cm in outer diameter
Implementation Method 5
Each LED unit mainly includes one or more LED dies, a metal base, a leadframe embedded into the metal base, optical material disposed over the LED dies, a reflector and a lens
Implementation Method 6
Each LED unit mainly includes one or more LED dies, a metal base, a leadframe embedded into the metal base, optical material disposed over the LED dies, a reflector and a lens
Data Source
AI summary
Seven thermally and optically efficient LED units and two control units are disclosed. Flashlights utilizing these LED units and control units are also disclosed. Such a flashlight mainly includes a cylindrical housing, a cylindrical rear cap, one of the seven LED units, one of the two control units. Each LED units are interchangeable between different emitting colors. Each LED unit mainly comprises a metal base, a reflector if the metal base is not a reflector itself, a leadframe formed attaching one or more metal pins to a printed circuit board, one or more LED dies mounted on the metal base, optical material disposed over the LED dies, and an optional lens to further focus the light.